Dressed-state approach to a simple radiating atom
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Elsevier B.V.
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We consider a system consisting of an atom in the dipole approximation, coupled to the electromagnetic field. Using recently introduced renormalized coordinates and dressed states, we give a non-perturbative solution to the atom radiation process. From this formalism a non-exponential decay law naturally emerges. However, at least for low frequencies and weak coupling, there is only a very small, practically non-detectable, deviation from a purely exponential decay, in agreement with all previous results in the literature. (c) 2005 Elsevier B.V. All rights reserved.
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Physics Letters A. Amsterdam: Elsevier B.V., v. 337, n. 1-2, p. 37-45, 2005.
